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Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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Design and implementation of mixed-mode transducers.

C H Chou1, B T Khuri-Yakub

  • 1Edward L. Ginzton Lab., Stanford Univ., CA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1989
PubMed
Summary

A new theory optimizes mixed-mode transducers for efficient, broad-bandwidth longitudinal and shear wave modes. Experimental results for lithium niobate transducers closely matched theoretical predictions, validating the design approach.

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Area of Science:

  • Materials Science
  • Acoustics Engineering
  • Solid State Physics

Background:

  • Designing mixed-mode transducers requires understanding their behavior under various acoustic loads.
  • Lithium niobate (LiNbO(3)) is a key material for piezoelectric applications due to its electromechanical properties.

Purpose of the Study:

  • To develop a theoretical framework for designing high-efficiency, broad-bandwidth mixed-mode transducers.
  • To experimentally validate the theoretical predictions using fabricated LiNbO(3) transducers.

Main Methods:

  • A theoretical model was developed to predict transducer properties with arbitrary acoustic loads.
  • Y-cut LiNbO(3) piezoelectric plates were fabricated on bismuth germanium oxide (Bi(12)GeO(20)) and fused quartz substrates.
  • Indium bonding and polishing were used to achieve operation in the 100-MHz frequency range.

Main Results:

  • Experimental data for round-trip insertion loss were collected for both longitudinal and shear wave modes.
  • The experimental results demonstrated excellent agreement with the theoretical predictions.
  • The fabricated transducers operated effectively in the targeted 100-MHz frequency range.

Conclusions:

  • The developed theory accurately predicts the performance of mixed-mode transducers.
  • The experimental validation confirms the effectiveness of the design approach for LiNbO(3) transducers.
  • This work provides a foundation for designing advanced acoustic transducers for diverse applications.